Quote Originally Posted by jrevens View Post
That's a good question and good points. I believe that there would be very little potential for corrosion with galvanized steel fittings and the cast aluminum manifolds. First of all, it is a generally very dry location and additionally the threads will probably be sealed from moisture by some kind of thread sealing compound. Secondly, the 2 metals are very close together on a galvanic series chart. Aluminum and plated (cadmium or zinc) steel are in contact with each other all over the place on most aircraft engines, including fasteners, fittings, etc. Stainless steel however would not be as good a choice from a potential corrosion standpoint.
Thank you John for your valuable input. Yes, the joint is completely sealed with thread lock.

Happy skies!
Harry